Request an appointment. Familial adenomatous polyposis (FAP) is a rare, inherited condition that causes extra tissue (polyps) to form in your large intestine (colon) and rectum. Polyps can also occur in the upper gastrointestinal tract, especially the upper part of your small intestine (duodenum).
An iron core will produce the strongest magnet. By increasing the size of the core you also increase the strength of the electromagnet. Compare the diagrams. Note: Look at the amount of coils, the size and number of the power source.
And the electric field is VERY powerful, so it all adds up. And in fact the magnetic fields created are relatively weak. We have to wind many turns around an electromagnet and put an iron core in it to boost the effects. Every turn around a coil is adding to the field, even though it is the same current.